As with most cultures, it really depends on the generation, and where/how they've grown up.

Some people in China are extremely kind and respectful, others are... not.

I am not disagreeing with you here though, I think that on average there is a lot of ignorance amongst Chinese tourists regarding cultural norms outside of China, but this is due to a lack of exposure/education around these norms. Overall, the younger generations seem a lot more global than their elders in the way that they think and behave.

Something that I take issue with, is seeing what the Chinese tourism business is doing to countries like Cambodia and Vietnam. Huge amounts of prime coastal land are being bought up by Chinese businesses for building fancy resorts and hotels to cater to the burgeoning Chinese middle class. The problem with this is that when Chinese people travel, they'll often stay exclusively in Chinese hotels, and eat at Chinese restaurants. This keeps tourism profits out of the hands of the poorer local businesses, which is a real shame.

Recently in Vietnam the Chinese government tried to get a 99 year lease on the island of Phu Quoc (and several other regions in Vietnam) for developing luxury resorts. There were massive protests over this in Vietnam, so the Chinese government retaliated by issuing an advisory telling it's citizens to not travel to Vietnam for holidays any more. I tried to exchange RMB for VND at a bank in China, and they wouldn't exchange the currency, because they said that the government didn't want people travelling there.
Businesses in Vietnam that rely on tourism would have taken a huge hit from this, as it was during the Chinese Golden Week holiday.

I just ignore my kids and play video games. They're doing an ok job raising themselves.

I have 3 boys, they all got into PUBG when it came out. So did I. So 4 of us right? Team right? Should be awesome right? F**k no. It's just like IRL... jump in a car and they're all fighting as to who gets to sit in front. And they're all fighting over the gd loot.